Export animated .egg
There is no built in exporter for the .egg format, you need to install a third-party add-on. It seems that for 2.5x - 2.7x you can use YABEE which is recommended in the Panda3D manual. For newer versions of Blender it seems that glTF is another option, although it seems that a plug-in for Panda3D's is needed to import the format according to this post on Panda3D's discourse.